Pinpoint Test J: DTC P1820, P1822, P1828 Or P1830

WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

J1 CHECK THE LOW TO HIGH/HIGH TO LOW RELAY CIRCUITS FOR VOLTAGE
- Ignition OFF.
- Disconnect: Low to High Relay C1129.
- Disconnect: High to Low Relay C1173.
- Measure the voltage between low to high motor relay C1129- 87, circuit SBB26 (YE/RD), harness side and ground.
- Measure the voltage between high to low motor relay C1173- 87, circuit SBB48 (VT/RD), harness side and ground.
  
  Fig 1: Measuring Voltage Between High To Low Motor Relay C1173- 87, Circuit SBB48 (VT/RD), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Are the voltages 9 volts or greater?
- Yes: GO to J2 .
- No: VERIFY BJB fuse 26 (30A) is OK. If OK, REPAIR circuit SBB26 (YE/RD). If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the self-test.
J2 CHECK THE LOW TO HIGH/HIGH TO LOW RELAY GROUND CIRCUITS
- Measure the resistance between low to high motor relay C1129-87a, circuit GD122 (BK), harness side and ground.
- Measure the resistance between high to low motor relay C1173-87a, circuit GD122 (BK), harness side and ground.
  
  Fig 2: Measuring Resistance Between High To Low Motor Relay C1173-87A, Circuit GD122 (BK), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes: GO to J3 .
- No: REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
J3 CHECK CIRCUITS CCF07 (BN/GN) AND CCF08 (GY/OG) FOR AN OPEN
- Disconnect: Transfer Case C350B.
- Measure the resistance between transfer case C350B-1, harness side and high to low motor relay C1173-30, circuit CCF08 (GY/OG), harness side.
  
  Fig 3: Measuring Resistance Between Transfer Case C350B-1, Harness Side And High To Low Motor Relay C1173-30, Circuit CCF08 (GY/OG), Harness Side
  Courtesy of FORD MOTOR CO.
- Measure the resistance between transfer case C350B-2, harness side and low to high relay C1129-30, circuit CCF07 (BN/GN), harness side.
  
  Fig 4: Measuring Resistance Between Transfer Case C350B-2, Harness Side And Low To High Relay C1129-30, Circuit CCF07 (BN/GN), Harness Side
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes: GO to J4 .
- No: REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
J4 CHECK THE RELAY CONTROL CIRCUITS CCF27 (GY) AND CCF28 (VT/GY) FOR AN OPEN
- Disconnect: 4X4 Control Module C281A.
- Measure the resistance between the 4X4 control module C281A-6, harness side and high to low relay C1173-86, circuit CCF27 (GY) harness side.
  
  Fig 5: Measuring Resistance Between 4X4 Control Module C281A-6, Harness Side And High To Low Relay C1173-86, Circuit CCF27 (GY) Harness Side
  Courtesy of FORD MOTOR CO.
- Measure the resistance between 4X4 control module C281A-5, harness side and high to low relay C1129-86, circuit CCF28 (VT/GY), harness side.
  
  Fig 6: Measuring Resistance Between 4X4 Control Module C281A-5, Harness Side And High To Low Relay C1129-86, Circuit CCF28 (VT/GY), Harness Side
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes: CARRY OUT the ISO Relay Component Test.
  Refer to COMPONENT TESTING -- F250- F550 for component testing.
  
  INSTALL a new relay(s) as necessary.
- No: REPAIR the affected circuit(s). CLEAR the DTCs. INSPECT and if necessary, clean the 4X4 control module and 4X4 relay connectors. REPEAT the self-test.